And what are the consequences of hating a belief, idea or concept? And how culpable are the said belief, idea or concept when it comes to assigning blame? Elaboration as follows:

Are you just going to sit there, think, "oh, religion is evil", and then continue on like nothing happens? If "yes", then by all means do continue. In fact, you don't need any justification if you don't want to do anything - everyone has the freedom of thought.

Or are you going to fight injustice brought by the belief, idea or concept? In that case, you're not going to gain co-operation of the believers who do symphatize and agree with you by attacking something they cherish. Imagine saying, "I hate Islam and Islamic terrorism - let us do something about the latter". Do you think your average non-terrorist Muslim would want to get onboard with your crusade? This of course applies to any belief system and atrocity - "Christians" and "gay marriage", or "communists" and "totalitarianism", or "Americans" and "American foreign policy".

On the subject of culpability, would atrocities cease to happen without religion? You might say "religion makes things easier", but so does gunpowder - so are we also going to despise modern chemistry?